γ-Fe_2O_3/AC脱硫剂的制备及低温脱除CS_2性能  

Preparation and performance of γ-Fe_2O_3/AC desulfurizer at low temperature for CS_2 removal

作　　者：金健 张智宏[1] 白鸿帆 JIN Jian;ZHANG Zhihong;BAI Hongfan(College of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《化工进展》2018年第11期4397-4404,共8页Chemical Industry and Engineering Progress

基　　金：江苏省产学研前瞻项目(BY2014037-10)

摘　　要：以活性炭(AC)为载体,用FeSO_4·7H_2O为原料,采用沉淀法制备Fe负载脱硫剂,通过XRD、FTIR、FE-SEM、ICP、H_2-TPR等方法对脱硫剂进行表征。从制备方法和焙烧温度的角度,研究脱硫剂低温脱除CS_2的性能以及造成其差异的原因。结果表明:采用FeSO_4先沉淀后焙烧,焙烧气氛是氮气的γ-Fe_2O_3/AC-N_2法生成的γ-Fe_2O_3结晶度最高,并且有效地增加了活性炭表面碱性基团数量,提高了负载量和分散性,使脱硫效果大大提升,当焙烧时有O_2存在会生成α-Fe_2O_3降低脱硫剂脱除CS_2的活性;使用γ-Fe_2O_3/AC-N_2法焙烧温度在500℃时,结晶度最高,脱硫剂的脱硫效果最好,吸附量达到40.41mg/g,当温度超过500℃时生成了Fe_3O_4,降低了脱硫效果,用4种动力学模型对γ-Fe_2O_3/AC在活性炭载体上的脱硫过程进行动力学描述,发现Elovich模型可以更好地描述CS_2在脱硫剂上的脱硫过程,其化学控制是主要因素。The iron loaded desulfurizers were prepared by precipitation method with AC as carrier and FeSO4·7H2O as raw material.The desulfurizers were characterized by XRD,FTIR,FE-SEM,ICP and H2-TPR.The performance of the desulfurizers in the CS2 low-temperature desorption was explored and the performance differences were analyzed from the aspects of preparation methods and calcination temperatures.The results showed that the crystallinity of generatedγ-Fe2O3 was the highest when the precursors were calcined in N2 after precipitation.The method increased the amount of basic groups on the surface of activated carbon,so that the capacity and dispersivity was increased.α-Fe2O3 was generated when the calcination gas contained oxygen,thus reduced the activation of CS2 desorption on the desulfurizer.The adsorption capacity reached 40.41mg/g when the calcination temperature ofγ-Fe2O3/AC-N2 method was 500℃.Fe3O4 was generated when the temperature was over 500℃,which would reduce the desulfurization effect.The desulfurization process onγ-Fe2O3/AC was fitted by four kinetics models.It was shown that the Elovich model could best describe the desulfurization process of CS2,and the main reaction control step was the chemical control.

关 键 词：活性炭 吸附剂 动力学 二硫化碳 低温 

分 类 号：TQ424.1[化学工程] X701.3[环境科学与工程—环境工程]